//
//  JSUIButton+Extension.swift
//  Weibo10
//
//  Created by 李金胜 on 16/4/8.
//  Copyright © 2016年 itheima. All rights reserved.
//
import UIKit

extension UIButton {
    
    /// `便利`构造函数
    convenience init(imageName: String, backImageName: String) {
        self.init()
        
        setImage(UIImage(named: imageName), forState: UIControlState.Normal)
        setImage(UIImage(named: imageName + "_highlighted"), forState: UIControlState.Highlighted)
        setBackgroundImage(UIImage(named: backImageName), forState: UIControlState.Normal)
        setBackgroundImage(UIImage(named: backImageName + "_highlighted"), forState: UIControlState.Highlighted)
        
        // 会根据背景图片的大小调整尺寸
        sizeToFit()
    }
}

